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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // = += -= *= /= %=
    let num = 10;
    num += 1; // num = num + 1
    console.log(num);
    num -= 1; // num = num - 1
    console.log(num);
    num *= 2; // num = num * 2
    console.log(num);
    num /= 2; // num = num / 2
    console.log(num);
    num %= 2; // num = num % 2
    console.log(num);
  </script>
</body>
</html>